Merv 11 Pleated Air Filter - 7 1/2" x 7 1/2" x 1" Quantity:12-pack Finally they are factory made

Finally they are factory made so you don‰۪t have to deal with the hassle of trying to cut and size your custom air filters and they come with a full warranty

some just refer to them as electrostatic filters

these can be purchased in any conceivable size

The "Practical Pleat" contains over 500% greater surface area than a MERV 10 one-inch pleat

In general

Merv 11 Pleated Air Filter - 7 1/2" x 7 1/2" x 1" Quantity:12-pack Finally they are factory madeAny Kind of Filter's Extended Surface Pleated Filters outperform ordinary furnace filters with medium efficiency and are designed for lower pressure drop, and long service life which reduces HVAC equipment maintenance and energy costs. A higher MERV rating means that the air filter that you are about to purchase possesses a higher amount impurity filtration ability than your ordinary filter.